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प्रश्न
The atomic number of an element 'X' is 11.
- Write the electronic configuration of X and find its valency.
- Write the formula and nature of its oxide.
उत्तर
(i) The electronic configuration of element X is : 2, 8, 1
Valency = 1
(ii) The formula of the oxide 'X' is X2O. It is because the valency of element 'X' is 1 and valency of oxygen is 2.
X2O is a basic oxide. Since, element X contains one electron in its valence shell, so it is a metal and metal forms basic oxides.
संबंधित प्रश्न
Rewrite the following statement after correction, if necessary:
Groups have elements with consecutive atomic numbers.
The element which forms a basis oxide has the atomic number of:
(a) 18
(b) 17
(c) 14
(d) 19
The element X forms a compound X2Y. Suggest an element that Y might be and give reasons for your choice.
Answer the following question.
Write the name, symbol, and electronic configuration of an element X whose atomic number is 11.
The elements A, B, and C belong to groups 1, 14, and 17 respectively of the Periodic Table. Which two elements will form ionic compounds?
Which one of the following statements is not correct about the trends in the properties of the elements of a group on going down in a group?
The atom of an element has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar?
In which group are inert elements placed?
Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al
Complete the following cross word puzzle
Across:
(1) An element with atomic number 12.
(3) Metal used in making cans and member of Group 14.
(4) A lustrous non-metal which has 7 electrons in its outermost shell.
Down:
(2) Highly reactive and soft metal which imparts yellow colour when subjected to flame and is kept in kerosene.
(5) The first element of second Period
(6) An element which is used in making fluorescent bulbs and is second member of Group 18 in the Modern Periodic Table
(7) A radioactive element which is the last member of halogen family.
(8) Metal which is an important constituent of steel and forms rust when exposed to moist air.
(9) The first metalloid in Modern Periodic Table whose fibres are used in making bullet-proof vests
